Merge branch 'from-linus' into upstream
[linux-2.6] / arch / sparc / kernel / setup.c
1 /*  $Id: setup.c,v 1.126 2001/11/13 00:49:27 davem Exp $
2  *  linux/arch/sparc/kernel/setup.c
3  *
4  *  Copyright (C) 1995  David S. Miller (davem@caip.rutgers.edu)
5  *  Copyright (C) 2000  Anton Blanchard (anton@samba.org)
6  */
7
8 #include <linux/errno.h>
9 #include <linux/sched.h>
10 #include <linux/kernel.h>
11 #include <linux/mm.h>
12 #include <linux/stddef.h>
13 #include <linux/unistd.h>
14 #include <linux/ptrace.h>
15 #include <linux/slab.h>
16 #include <linux/initrd.h>
17 #include <asm/smp.h>
18 #include <linux/user.h>
19 #include <linux/a.out.h>
20 #include <linux/screen_info.h>
21 #include <linux/delay.h>
22 #include <linux/fs.h>
23 #include <linux/seq_file.h>
24 #include <linux/syscalls.h>
25 #include <linux/kdev_t.h>
26 #include <linux/major.h>
27 #include <linux/string.h>
28 #include <linux/init.h>
29 #include <linux/interrupt.h>
30 #include <linux/console.h>
31 #include <linux/spinlock.h>
32 #include <linux/root_dev.h>
33 #include <linux/cpu.h>
34
35 #include <asm/system.h>
36 #include <asm/io.h>
37 #include <asm/processor.h>
38 #include <asm/oplib.h>
39 #include <asm/page.h>
40 #include <asm/pgtable.h>
41 #include <asm/traps.h>
42 #include <asm/vaddrs.h>
43 #include <asm/kdebug.h>
44 #include <asm/mbus.h>
45 #include <asm/idprom.h>
46 #include <asm/machines.h>
47 #include <asm/cpudata.h>
48 #include <asm/setup.h>
49
50 struct screen_info screen_info = {
51         0, 0,                   /* orig-x, orig-y */
52         0,                      /* unused */
53         0,                      /* orig-video-page */
54         0,                      /* orig-video-mode */
55         128,                    /* orig-video-cols */
56         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
57         54,                     /* orig-video-lines */
58         0,                      /* orig-video-isVGA */
59         16                      /* orig-video-points */
60 };
61
62 /* Typing sync at the prom prompt calls the function pointed to by
63  * romvec->pv_synchook which I set to the following function.
64  * This should sync all filesystems and return, for now it just
65  * prints out pretty messages and returns.
66  */
67
68 extern unsigned long trapbase;
69 void (*prom_palette)(int);
70
71 /* Pretty sick eh? */
72 void prom_sync_me(void)
73 {
74         unsigned long prom_tbr, flags;
75
76         /* XXX Badly broken. FIX! - Anton */
77         local_irq_save(flags);
78         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
79         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
80                              "nop\n\t"
81                              "nop\n\t"
82                              "nop\n\t" : : "r" (&trapbase));
83
84         if (prom_palette)
85                 prom_palette(1);
86         prom_printf("PROM SYNC COMMAND...\n");
87         show_free_areas();
88         if(current->pid != 0) {
89                 local_irq_enable();
90                 sys_sync();
91                 local_irq_disable();
92         }
93         prom_printf("Returning to prom\n");
94
95         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
96                              "nop\n\t"
97                              "nop\n\t"
98                              "nop\n\t" : : "r" (prom_tbr));
99         local_irq_restore(flags);
100
101         return;
102 }
103
104 unsigned int boot_flags __initdata = 0;
105 #define BOOTME_DEBUG  0x1
106 #define BOOTME_SINGLE 0x2
107
108 /* Exported for mm/init.c:paging_init. */
109 unsigned long cmdline_memory_size __initdata = 0;
110
111 static void
112 prom_console_write(struct console *con, const char *s, unsigned n)
113 {
114         prom_write(s, n);
115 }
116
117 static struct console prom_debug_console = {
118         .name =         "debug",
119         .write =        prom_console_write,
120         .flags =        CON_PRINTBUFFER,
121         .index =        -1,
122 };
123
124 int obp_system_intr(void)
125 {
126         if (boot_flags & BOOTME_DEBUG) {
127                 printk("OBP: system interrupted\n");
128                 prom_halt();
129                 return 1;
130         }
131         return 0;
132 }
133
134 /* 
135  * Process kernel command line switches that are specific to the
136  * SPARC or that require special low-level processing.
137  */
138 static void __init process_switch(char c)
139 {
140         switch (c) {
141         case 'd':
142                 boot_flags |= BOOTME_DEBUG;
143                 break;
144         case 's':
145                 boot_flags |= BOOTME_SINGLE;
146                 break;
147         case 'h':
148                 prom_printf("boot_flags_init: Halt!\n");
149                 prom_halt();
150                 break;
151         case 'p':
152                 /* Use PROM debug console. */
153                 register_console(&prom_debug_console);
154                 break;
155         default:
156                 printk("Unknown boot switch (-%c)\n", c);
157                 break;
158         }
159 }
160
161 static void __init process_console(char *commands)
162 {
163         serial_console = 0;
164         commands += 8;
165         /* Linux-style serial */
166         if (!strncmp(commands, "ttyS", 4))
167                 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
168         else if (!strncmp(commands, "tty", 3)) {
169                 char c = *(commands + 3);
170                 /* Solaris-style serial */
171                 if (c == 'a' || c == 'b')
172                         serial_console = c - 'a' + 1;
173                 /* else Linux-style fbcon, not serial */
174         }
175 #if defined(CONFIG_PROM_CONSOLE)
176         if (!strncmp(commands, "prom", 4)) {
177                 char *p;
178
179                 for (p = commands - 8; *p && *p != ' '; p++)
180                         *p = ' ';
181                 conswitchp = &prom_con;
182         }
183 #endif
184 }
185
186 static void __init boot_flags_init(char *commands)
187 {
188         while (*commands) {
189                 /* Move to the start of the next "argument". */
190                 while (*commands && *commands == ' ')
191                         commands++;
192
193                 /* Process any command switches, otherwise skip it. */
194                 if (*commands == '\0')
195                         break;
196                 if (*commands == '-') {
197                         commands++;
198                         while (*commands && *commands != ' ')
199                                 process_switch(*commands++);
200                         continue;
201                 }
202                 if (!strncmp(commands, "console=", 8)) {
203                         process_console(commands);
204                 } else if (!strncmp(commands, "mem=", 4)) {
205                         /*
206                          * "mem=XXX[kKmM] overrides the PROM-reported
207                          * memory size.
208                          */
209                         cmdline_memory_size = simple_strtoul(commands + 4,
210                                                      &commands, 0);
211                         if (*commands == 'K' || *commands == 'k') {
212                                 cmdline_memory_size <<= 10;
213                                 commands++;
214                         } else if (*commands=='M' || *commands=='m') {
215                                 cmdline_memory_size <<= 20;
216                                 commands++;
217                         }
218                 }
219                 while (*commands && *commands != ' ')
220                         commands++;
221         }
222 }
223
224 /* This routine will in the future do all the nasty prom stuff
225  * to probe for the mmu type and its parameters, etc. This will
226  * also be where SMP things happen plus the Sparc specific memory
227  * physical memory probe as on the alpha.
228  */
229
230 extern int prom_probe_memory(void);
231 extern void sun4c_probe_vac(void);
232 extern char cputypval;
233 extern unsigned long start, end;
234 extern void panic_setup(char *, int *);
235
236 extern unsigned short root_flags;
237 extern unsigned short root_dev;
238 extern unsigned short ram_flags;
239 #define RAMDISK_IMAGE_START_MASK        0x07FF
240 #define RAMDISK_PROMPT_FLAG             0x8000
241 #define RAMDISK_LOAD_FLAG               0x4000
242
243 extern int root_mountflags;
244
245 char reboot_command[COMMAND_LINE_SIZE];
246 enum sparc_cpu sparc_cpu_model;
247
248 struct tt_entry *sparc_ttable;
249
250 struct pt_regs fake_swapper_regs;
251
252 void __init setup_arch(char **cmdline_p)
253 {
254         int i;
255         unsigned long highest_paddr;
256
257         sparc_ttable = (struct tt_entry *) &start;
258
259         /* Initialize PROM console and command line. */
260         *cmdline_p = prom_getbootargs();
261         strcpy(saved_command_line, *cmdline_p);
262
263         /* Set sparc_cpu_model */
264         sparc_cpu_model = sun_unknown;
265         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
266         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
267         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
268         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
269         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
270         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
271         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
272
273 #ifdef CONFIG_SUN4
274         if (sparc_cpu_model != sun4) {
275                 prom_printf("This kernel is for Sun4 architecture only.\n");
276                 prom_halt();
277         }
278 #endif
279         printk("ARCH: ");
280         switch(sparc_cpu_model) {
281         case sun4:
282                 printk("SUN4\n");
283                 break;
284         case sun4c:
285                 printk("SUN4C\n");
286                 break;
287         case sun4m:
288                 printk("SUN4M\n");
289                 break;
290         case sun4d:
291                 printk("SUN4D\n");
292                 break;
293         case sun4e:
294                 printk("SUN4E\n");
295                 break;
296         case sun4u:
297                 printk("SUN4U\n");
298                 break;
299         default:
300                 printk("UNKNOWN!\n");
301                 break;
302         };
303
304 #ifdef CONFIG_DUMMY_CONSOLE
305         conswitchp = &dummy_con;
306 #elif defined(CONFIG_PROM_CONSOLE)
307         conswitchp = &prom_con;
308 #endif
309         boot_flags_init(*cmdline_p);
310
311         idprom_init();
312         if (ARCH_SUN4C_SUN4)
313                 sun4c_probe_vac();
314         load_mmu();
315         (void) prom_probe_memory();
316
317         phys_base = 0xffffffffUL;
318         highest_paddr = 0UL;
319         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
320                 unsigned long top;
321
322                 if (sp_banks[i].base_addr < phys_base)
323                         phys_base = sp_banks[i].base_addr;
324                 top = sp_banks[i].base_addr +
325                         sp_banks[i].num_bytes;
326                 if (highest_paddr < top)
327                         highest_paddr = top;
328         }
329         pfn_base = phys_base >> PAGE_SHIFT;
330
331         if (!root_flags)
332                 root_mountflags &= ~MS_RDONLY;
333         ROOT_DEV = old_decode_dev(root_dev);
334 #ifdef CONFIG_BLK_DEV_RAM
335         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
336         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
337         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);     
338 #endif
339
340         prom_setsync(prom_sync_me);
341
342         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 
343            ((*(short *)linux_dbvec) != -1)) {
344                 printk("Booted under KADB. Syncing trap table.\n");
345                 (*(linux_dbvec->teach_debugger))();
346         }
347
348         init_mm.context = (unsigned long) NO_CONTEXT;
349         init_task.thread.kregs = &fake_swapper_regs;
350
351         paging_init();
352
353         smp_setup_cpu_possible_map();
354 }
355
356 static int __init set_preferred_console(void)
357 {
358         int idev, odev;
359
360         /* The user has requested a console so this is already set up. */
361         if (serial_console >= 0)
362                 return -EBUSY;
363
364         idev = prom_query_input_device();
365         odev = prom_query_output_device();
366         if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
367                 serial_console = 0;
368         } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
369                 serial_console = 1;
370         } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
371                 serial_console = 2;
372         } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
373                 prom_printf("MrCoffee ttya\n");
374                 serial_console = 1;
375         } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
376                 serial_console = 0;
377                 prom_printf("MrCoffee keyboard\n");
378         } else {
379                 prom_printf("Confusing console (idev %d, odev %d)\n",
380                     idev, odev);
381                 serial_console = 1;
382         }
383
384         if (serial_console)
385                 return add_preferred_console("ttyS", serial_console - 1, NULL);
386
387         return -ENODEV;
388 }
389 console_initcall(set_preferred_console);
390
391 extern char *sparc_cpu_type;
392 extern char *sparc_fpu_type;
393
394 static int ncpus_probed;
395
396 static int show_cpuinfo(struct seq_file *m, void *__unused)
397 {
398         seq_printf(m,
399                    "cpu\t\t: %s\n"
400                    "fpu\t\t: %s\n"
401                    "promlib\t\t: Version %d Revision %d\n"
402                    "prom\t\t: %d.%d\n"
403                    "type\t\t: %s\n"
404                    "ncpus probed\t: %d\n"
405                    "ncpus active\t: %d\n"
406 #ifndef CONFIG_SMP
407                    "CPU0Bogo\t: %lu.%02lu\n"
408                    "CPU0ClkTck\t: %ld\n"
409 #endif
410                    ,
411                    sparc_cpu_type ? sparc_cpu_type : "undetermined",
412                    sparc_fpu_type ? sparc_fpu_type : "undetermined",
413                    romvec->pv_romvers,
414                    prom_rev,
415                    romvec->pv_printrev >> 16,
416                    romvec->pv_printrev & 0xffff,
417                    &cputypval,
418                    ncpus_probed,
419                    num_online_cpus()
420 #ifndef CONFIG_SMP
421                    , cpu_data(0).udelay_val/(500000/HZ),
422                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
423                    cpu_data(0).clock_tick
424 #endif
425                 );
426
427 #ifdef CONFIG_SMP
428         smp_bogo(m);
429 #endif
430         mmu_info(m);
431 #ifdef CONFIG_SMP
432         smp_info(m);
433 #endif
434         return 0;
435 }
436
437 static void *c_start(struct seq_file *m, loff_t *pos)
438 {
439         /* The pointer we are returning is arbitrary,
440          * it just has to be non-NULL and not IS_ERR
441          * in the success case.
442          */
443         return *pos == 0 ? &c_start : NULL;
444 }
445
446 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
447 {
448         ++*pos;
449         return c_start(m, pos);
450 }
451
452 static void c_stop(struct seq_file *m, void *v)
453 {
454 }
455
456 struct seq_operations cpuinfo_op = {
457         .start =c_start,
458         .next = c_next,
459         .stop = c_stop,
460         .show = show_cpuinfo,
461 };
462
463 extern int stop_a_enabled;
464
465 void sun_do_break(void)
466 {
467         if (!stop_a_enabled)
468                 return;
469
470         printk("\n");
471         flush_user_windows();
472
473         prom_cmdline();
474 }
475
476 int serial_console = -1;
477 int stop_a_enabled = 1;
478
479 static int __init topology_init(void)
480 {
481         int i, ncpus, err;
482
483         /* Count the number of physically present processors in
484          * the machine, even on uniprocessor, so that /proc/cpuinfo
485          * output is consistent with 2.4.x
486          */
487         ncpus = 0;
488         while (!cpu_find_by_instance(ncpus, NULL, NULL))
489                 ncpus++;
490         ncpus_probed = ncpus;
491
492         err = 0;
493         for_each_online_cpu(i) {
494                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
495                 if (!p)
496                         err = -ENOMEM;
497                 else
498                         register_cpu(p, i);
499         }
500
501         return err;
502 }
503
504 subsys_initcall(topology_init);